Parameters

Description of tag parameters is shown below.

  • Name: is used for naming the data represented by the tag.

  • Device: identifies the device the tag is associated with.

  • Address: identifies the data area, as well as defines data type and dimension, and can affect the access rights. Address format depends on the specified device.

  • Update Rate: determines how frequently a tag is updated (in milliseconds). The 0 value indicates that the tag must not be updated (but it will be available for writing).

  • Access: defines the access rights provided to the client (Read/Write or Read Only). Access rights can also depend on the specified address, for example: Internal Modbus registers always have read-only access rights. How to specify the read and write access rights of a tag for a specific user is described below.

  • Converter: specifies conversion applied to tag value. The following conversions are available: division by a specified number, linear scaling, logical “NOT” (available only for the boolean data type).

  • Comment: contains any custom text.

  • Change Trigger: specifies change notification mode.

Most of the parameters described above are available as OPC UA items. More information about editing server object properties via OPC UA is described here.

Last updated